So someone with the set bonus requires only 25% Haste to effectively generate the same amount of HoPo as you. That's a pretty huge gap. Anyone with the set bonus and more than 25% Haste gains more HoPo than you can ever manage without the set bonus.

(This is not entirely true, as GC procs aren't based on Haste, but that only lessens the benefit of having a very high Haste.)

Of course you have the advantage of more SoI and EF ticks. You also deal a little more damage overall. TMI clearly indicates it as a survivability loss to skip on the set bonus.